NumberResearchRecent prefix assignments
0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/20/2026
The Code holder is who opened each NPA-NXX prefix — not necessarily who holds the numbers. A prefix is 10,000 numbers, but under pooling its ten 1,000-number blocks are handed out individually, often to different carriers; the code holder may hold only one block, or none. The Thousands-blocks column shows how the ten blocks are really split — click which blocks → to see who holds each 1,000-number block and its last-4-digit range. Assignments are initial assignments; the current serving carrier may differ due to portability.
| Assigned | NPA-NXX | Thousands-blocks taken (last-4 opening) | Code holder | OCN | Rate center | State |
|---|---|---|---|---|---|---|
| 2022-03-10 | 605-909 | 0–9 XXXall 10 · 4 holders which blocks → | TON80 COMMUNICATIONS, LLC | 516J | HILL CITY | SD |
| 2022-02-24 | 605-992 | 2XXX7XXX8XXX · 3 holders which blocks → | TON80 COMMUNICATIONS, LLC | 516J | BIGSTONECY | SD |
| 2022-02-08 | 605-982 | 0–9 XXXall 10 · 6 holders which blocks → | TON80 COMMUNICATIONS, LLC | 516J | ABERDEEN | SD |
| 2022-01-14 | 605-898 | 0XXX1XXX2XXX3XXX4XXX8XXX · 4 holders which blocks → | TON80 COMMUNICATIONS, LLC | 516J | IROQUOIS | SD |
| 2022-01-13 | 605-634 | 0XXX1XXX2XXX3XXX · 4 holders which blocks → | TON80 COMMUNICATIONS, LLC | 516J | CAVOUR | SD |
| 2022-01-13 | 605-752 | 9XXX which blocks → | TON80 COMMUNICATIONS, LLC | 516J | FTTHOMPSON | SD |
| 2022-01-10 | 605-746 | 7XXX which blocks → | TON80 COMMUNICATIONS, LLC | 516J | PLATTE | SD |
Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/20/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.